yes the reverse switch was the main focus on the position of my box,
1 of the switch pins is level with the rear face/edge of TT4 so i,m soldering on the wires to the switch pins with a connector block about 3inches away to allow the box to be disconnected from the wiring, and so not needing to use the original rubber switch plug which would foul TT4.
i,m sure your chassis is spot on
andy